Tag Archives: : basal area

Floristic Composition, Diversity and Structure of Two Proposed Community Forests in the Deng Deng National Park-Belabo Council Forest Conservation Corridor, East Region of Cameroon (Published)

The assessment of floristic composition of every ecosystem is very important in ecological planning and productivity.  The main objective of this study was to determine the species composition, structure and diversity in two community forests between the Deng Deng National Park and the Belabo Council Forest.  The transect method was employed in data collection. Four long transects were established parallel to each other in each community forest at a distance of 2km apart. In each transect, plots of 20x500m were established at interval of 500m. A total of 25 plots 20x500m (1ha each) were established in the two community forests; 13 plots in community forest one (KEBO) and 12 plots in community forest two (KEPOL). This gave a total of 0.25% of the total land surface sampled in both community forests. Within each plot, all individual trees≥10cm were identified, measured, and recorded.  A subplot of 10x10m was established in each plot to identify trees of <.10cm. The identification of plants was done using a combination of characters such as the general form of the tree (butresses, roots systems, bark texture; slash colour, smell, leaf type and shape) as well as the flowers, and fruits of the trees.  The dbh of all trees were measured at 1.3 using the dbh metal tape. The height of trees was measured through estimation (average estimates of all field researchers). Results revealed a total of seven thousand eight hundred and seventeen (7817) individual plants with dbh ≥10cm in the entire study area. From this number,  4108 tree stems   ≥10cm were identified and measured in community forest (KEBO) one. This belongs to 156 species in 41 families. In community forest two (KEPOL), a total of and 3708 stems were identified and measured. This belongs to 149 species in 41 families. Fabaceae  ,Malvaceae , Euphorbiaceae and Rubiaceae were found to be the most dominant plant families while Drypetes sp, Annonidium manii and Funtumia africana were found to be  the most dominant plant species. Species composition and diversity varied in the two community forests. Community forest one  was  characterized by high diversity and similar species composition shown by the Shannon diversity index of 3.6 while community forest two showed signs of poor diversity as seen from the index of 3.41. Tree basal area was high in KEPOL than KEPOL. Species in the different plots were similar but with outliers of plot 4 in KEBO and plot 12 in KEPOL had species which were far more different from the rest of the plots.

 

Keywords: : basal area, Composition, Diversity, Structure, floristic

Autecological Studies of Triplochiton Scleroxylon K. Schum in Gambari Forest Reserve, Oyo State, Nigeria (Published)

Ten temporary plots were laid within Triplochiton scleroxylon woodland in Gambari Forest Reserve, one of the major rainforests in Nigeria (Latitude 7025IN and 7055I and Longitude 3053Iand 309IE) of attempts to assess tree species and their effects on surrounding soil in Triplochiton scleroxylon woodland. The tree species diversity was assessed using the sample plots laid in systematic line transects. In each sample plot, all trees with a diameter at breath height (DBH) above 10cm were identified by species and measured. The species diversity within 5 meter range of T. scleroxylon was shown to be high using Simpson diversity Index, 0.93 with low Dominance of 0.07 and Evenness of 0.85 indicating relative moderate range. The results showed that high diversity of tree species was enumerated in the study area with Triplochiton scleroxylon 36.00% followed by Funtumia elastica with 8.00%. Considering T. scleroxylon species, Plot 10 recorded the highest values for Basal Area and Volume, 3.386m2 and 468.961m3 respectively followed by Plot 2 with BA (2.759m2) and Volume (293.006m3) with lowest BA of 0.656m2 for Plot 8, and least Volume of 24.22m3 recorded against Plot 7. Plots 6 and 9 had no presence of T. scleroxylon with Plot 6 having 2.71% Organic Carbon greater than Plot 3 with highest frequency of T. scleroxylon of 2.52%. Sample 2 has the pH of 7.40 which is alkaline in nature as it can lead to the factor of high volume of Triplochiton scleroxylon, soil particles in the study area revealed that sand, silt and clay were in moderate for the growth of Triplochiton scleroxylon. The Nitrogen (%), Phosphorus (mg/kg) and Potassium (mg/kg) (NPK) were well utilized in interaction form by the high presence of T. scleroxylon (Plot 3), 0.21, 3.60 and 0.51 respectively while despite the presence of other tree species beside T. scleroxylon in Plot 2, NPK were not interactively utilized as in Plot 3 with the values of 0.3%, 4.94mg/kg and 0.65mg/kg respectively.

Keywords: : basal area, DBH, autecology, height, simpson rule, volume